Leo Maas
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Vortices:
A Meddy (Meditterranean eddy) is a vortex living at depths of nearly 1000 m, having a horizontal radius of dozens to a hundred kilometers, and living up to two years. Upon closer inspection its interior appears to be stably stratified, albeit at a weaker rate than the environment. Such a meddy's dynamics can be described by a relatively compact set of differential equations.
Publications:
Maas, L.R.M., Zahariev, K. (1996) An exact, stratified model of a meddy.  Dynamics of Atmospheres and Oceans, 24: 215-225. ( Download as PDF-file )   Maas, L.R.M. (1993) Nonlinear and free-surface effects on the spin-down of barotropic axisymmetric vortices.  Journal of Fluid Mechanics, 246: 117-141.